The encrypted control method is based on the homomorphism of cryptosystems that enables implementation of controller computation in an encrypted manner [1]}, [2]}, [3]}, [4]}.
The controller parameters and inputs/outputs of an encrypted controller are encrypted against attackers originating outside the closed-loop system.
This control method can be implemented for the secure outsourcing computation of controllers to a public cloud because the control inputs are computed without using a decryption key.
